The object is basically to keep extending a chain of adjectives, in a knit-one-purl-one manner.
The first player says an adjective. The second player then has to say an antonym: a word that means the opposite. The next player says a synonym: a word that means the same as the preceding
word. The next player says an antonym of this. And so the play proceeds: antonyms alternating with synonyms.
Anyone who cannot think of an appropriate word fairly quickly or who repeats a word is out. The players remaining start a new round.